Installation And Piping - Toshiba LQ500 Operation Manual

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3.3 Installation and Piping

Figures 3.3.1 through 3.3.4 are examples of density meter installation.
[NOTE]
(1) Install the meter in a place where density distribution is uniform.
(2) Avoid such a location where the measured matter will settle and build up on the bottom of
the density meter.
(3) Avoid such a location which will allow bubbles to move into the pipe line.
(4) We recommend that this density meter should be installed to a vertical piping system.
Horizontal installation can also be used with the same performance but under the following
conditions, vertical installation must be chosen:
(5) Especially in the following situations, make sure that the piping is vertical.
a) Bubbles may stay in the pipe.
b) Slow flow speed or other factors may cause the measured matter to sink or float
substantially making the distribution of the measured-matter density uneven in the pipe.
c) The main pipe has been enlarged thus using the density meter of a diameter greater than
that of the main pipe.
(6) When installing on the horizontal piping, make sure that the meter is installed directly on top
of the converter section for purposes of maintenance and performance assurance (in other
words, so that the paired applicator sections are placed directly side by side).
(7) This density meter does not distinguish between the upstream side and the downstream side.
Neither does it require a straight tube length. Install it in a direction that will make
maintenance easy.
(8) The front side of the density meter's converter section is equipped with an LCD density
display section. When installing the meter, choose a location and direction in which this
density display section will be easily visible. (See Fig. 3.3.3)
(9) When you anticipate a marginal error between the side-to-side dimensions of this density
meter and the installation space of the piping line, prepare a loose mechanism in advance.
(10) To minimize the impact of the bubbles mingled, it is recommended that the meter be installed
on a location as far as possible from the pipe outlet for air release but still within the distance
where a reasonable degree of hydraulic pressure is applied.
(11) In the event that the density meter may no longer be full of the fluid while the pump is shut
down or the density distribution in the density meter may become uneven, make sure to take
measurements only while the pump is operating by using the external interlock function.
(12) Take necessary measures to prevent vibration from a pump or other equipment applied to
the density meter transmitted through the piping.
(13) On both the upstream and downstream sides of the density meter, install shutoff valves.
Furthermore, between these valves and the density meter, install the sampling port, the zero
water supply port, the air release port, the drain port with a shutoff valve attached
respectively. In the event that the flow of the pipe line cannot be stopped, provide a bypass
pipe halfway with a shutoff valve attached. When performing zero point calibration, these
are needed to discharge the measured matter out of the density meter through its drain port
and fill up the meter with fresh water of zero density. (See Fig.3.3.1 and Fig.3.3.2)
(14) As for gaskets to be used in piping, select the one with the dimension conforming to the
flange standard and of the material appropriate for the substance to be measured.
(15) If the cover of the density meter is removed or the density meter is disassembled while the
meter is powered, radio waves will leak out. (However, the amount is about equal to PHS
and one tenth of mobile phones.)
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